Solar cell and preparation method thereof

Abstract

A solar cell includes silicon substrate and stack structure. stack structure is provided on rear surface of silicon substrate along thickness direction of solar cell. Silicon substrate and stacked structure contain antimony element. Stack structure at least includes first oxide layer, first doped polycrystalline silicon layer, second oxide layer and second doped polycrystalline silicon layer which are sequentially stacked along thickness direction of solar cell. Antimony doping concentration in second oxide layer is higher than antimony doping concentration in first doped polycrystalline silicon layer. Antimony element in stack structure can be bonded with silicon element, thereby effectively improving passivation effect, solving problem of low conductivity of carriers, and thus enhancing working efficiency of solar cell. Stack structure has certain concentration gradient characteristic along thickness direction of solar cell, which can improve conductivity of carriers in stack structure, and thereby reducing series resistance of solar cell.

Dependencies are inferred from the claim text.